被动雷达导引头发展历程及技术综述

被动雷达导引头主要功能是完成对辐射源的截获和跟踪,其技术性能将直接影响反辐射导弹的性能.论述了被动雷达导引头的发展历程以及导引头的系统组成,对被动雷达导引头的主要技术指标进行了介绍,最后对被动雷达导引头的发展趋势进行了预测.     

反舰导弹被动雷达导引头研究

本文分析了被动雷达导引头的原理，并对被动雷达导引头的关键技术进行了研究，为发展反舰导弹被动雷达导引头提供参考。     

机载雷达参数分析与被动雷达导引头设计探讨

与主动雷达导引头不同，被动雷达导引头的性能在一定程度上决定于目标雷达的参数，对于被动雷达导引头的设计，研究导引头所攻击目标雷达的参数分布特点具有指导意义。本文针对空空导弹的攻击目标分析其机载雷达的参数分布特点，并根据机载雷达的参数特点对被动雷达导引头的设计问题进行了探讨。     

导弹主被动雷达导引头共口径技术研究?

导引头共口径技术是主被动雷达导引头关键技术之一。针对导弹主被动雷达导引头内部空间有限的问题,提出了导引头共口径技术,采取了把微带贴片天线应用到导引头表面的措施,得到了预期的结果。通过对微带贴片天线的设计,研究导弹主被动雷达导引头的性能,经过分析和仿真表明所提出方法的有效性。     

宽带被动导引头技术的分析

被动雷达导引头由于没有微波辐射源，具有隐蔽性好，抗电子干扰能力强和作用距离远等特点，在现代战争中有很强的生命力和实用意义，为各国各军种所重视。本文首先综述了国外被动雷达导引的发展和应用概况；然后介绍了被动雷达导引头的技术特点和应用条件；并着重分析了宽带被动雷达导引头的三个主要系统：宽频带天线，宽频带接收机，和数字信号处理单元及其关键技术；最后提出了宽带被动雷达导引头的发展趋势的预测。     

远程反辐射导弹被动雷达导引头技术研究

提出了发展远程反辐射导弹的必要性，研究了反辐射导弹被动雷达导引头技术，指出了超宽频带被动雷达导引头的局限性。     

抗诱饵对反辐射导弹需用过载的影响研究

在分析诱饵干扰反辐射导弹的基本原理和前提条件的基础上,指出反辐射导弹对抗诱饵干扰的基本方法有：减小导引头天线的分辨角;增大导弹的杀伤半径;加大导弹的机动性能;导引头将接收到的信号与弹上雷达库预先存储的典型目标特征进行比对,区分出目标和诱饵等．论证了在被动雷达导引头现有技术水平下,为有效对抗雷达诱饵干扰对导弹过载能力的要求．     

多路径效应对反辐射导弹被动雷达导引头性能的影响分析

针对反辐射导弹被动雷达导引头的特点,给出了多路径情况下的方向图传播因子.分别分析了目标雷达波经镜面反射、漫反射和地物反射三种不同反射方式所产生的多路径效应对被动雷达导引头工作性能的影响,并给出了一些有意义的结论和建议.     

空空导弹主被动雷达多模导引头研究

主被动雷达多模导引头是现代空空导弹末制导系统的一个重要研究方向。本文针对主被动雷达多模导引头设计时的关键技术,如宽频带天线罩、主被动复合天线、高灵敏度接收机、信息融合处理等技术,及其实现途径进行了分析,指出导引头设计时尤其要注意宽频带天线罩、复合天线设计时的数字补偿以及抗干扰性能设计时的主被动测量信息的融合处理。     

多路径效应对被动导引头测向性能影响分析

针对被动雷达导引头测角结果易受多路径影响,结合反辐射导弹攻击过程,构建被动雷达导引头测角模型。通过对不同条件下被动导引头测角性能受多路径效应影响的仿真分析,得出减少多径对导引头测角影响的有效途径,在实际作战中具有重要的参考和借鉴意义。     

Nitrosation and Nitration of Tetraacetyldibenzylhexaazaisowurtzitane

Tetraacetyldibenzylhitane (TADBIW) was subjected to debenzylation by nitrosating with inorganic materials available commercially to synthesize tetraacetyldinitrosohexaazaisowurtzitane (TADNSIW). TADNSIW was purified, and its structure was determined by FTIR, 1H NMR, MS and element analysis. The debenzylation reaction of TADBIW gave quantitative benzaldehyde as a by-product. This indicates that the reaction produces an imine cation as an intermediate. Hexanitrohexaazaisowurtzitane (HNIW) was prepared from unpurified TADNSIW with the yield over 96.0 % and the purity more than 98.0 %. And the mechanism of the reaction from TADNSIW to HNIW is proposed to be oxidation of nitroso and nitration of acetyl on the molecule of TADNSIW, This reaction system involved is simple, and the reaction can complete within a short time and under mild conditions. The product can be easily to separate and the waste disposed readily.     

A Robust Algorithm for Watermarking 2D Vector Maps with Low Shape-Distortions

The technique of watermarking has been introduced into 2D vector maps for many potential applications such as protecting the copyright of important GIS （geographical information system） data and tracing the data source of military maps. In most previous works, although the validity of the map data could be preserved during the embedding procedure, the shape-distortions of the map elements are usually neglected which would tend to degrade the invisibility of the watermarking schemes. A shape-preserving algorithm for watermarking 2D vector maps is presented in this paper. A 1D distance sequence extracted from the original map is adopted as the cover data instead of 2D coordinates. A watermark bit is represented by changing the distributions of the cover data. The embedding procedure induces lower shape-distortions than in former works. Experimental results indicate better invisibility of the proposed scheme, as well as its robustness to certain attacks such as map simplification, interpolation, additive noise and most geometric transforms.     

Open Rule-setting System Applied to Conceptual Design of Engines

Open rule-setting method advanced in this paper concentrates on providing designers of engines with a convenient way to express their design innovations and develop the expected prototypes in the early CAD stage, and constitute effective models for the following analysis process of CAE and CAPP. The problems arisen in the process of conceptual design with the traditional experience-based development method are analyzed. Based on those analyses, open rule-setting method is presented and some associated technical problems are discussed. The functional framework of open rule-setting system was built as software engineering methods. The speciality of the engine product as a kind of complex product and the requirement of the engine product based on its structural particularity to rule-setting system are considered carefully. A demonstration is supplied to illustrate how the open rule-setting method enhances the efficiency and quality of the engine conceptual design.     

Research on Linux Network Device Driver

By analyzing the working principle of Linux network device driver, discussing the Linux network driver structure and its key technologies, the general network driver structure and its design methodologies in Linux system are summarized. Through modifying the network device driver of Linux device driver 3rd version snull, c and improving the COW technology, the Zero-Copy technology in Linux （kernel version 2.6.11 ） is implemented. In the end, the success test tells us that the thorough analysis of network device driver is the foundation of many applications, and it also provides a certain improvement to a lot of real applications, even to military application development.     

Improvement and Experiment of the Reamer in Vibra Cutter Against Wave Edge of Titanium Sheet Alloy Parts

By analyzing the influencing factors of part quality making of sheet alloy of titanium by vibra cutter, the shape of upper reamer is set as cylinder and wedge-shaped form, and the lower reamer as plain and hemicycle form, and its main structural parameters are defined as well. Then it is validated further that such improved vibra cutter reamer can be used to process curve-edged parts of titanium alloy sheet. The experimental result shows that the titanium alloy sheet parts processed by above equipment have no sharpen angles for convex parts and evident crevasse of concave-edged part. In summary, such improvement can eliminate the free-waved edge and improve the manufacture quality of titanium alloy sheet parts greatly.     

Experimental Study on the Small Flyer Initiating Behavior of Fine-grained Explosives

The initiating behavior of fine-grained explosives by small flyer is studied. The diameter of small flyer in this device is 1 ram. The test results indicate that the granularity of explosives has great effect on its flyer initiating sensitivity.The flyer initiating sensitivity of the fine-grained explosives is higher and the critical initiating energy is lower than that of common explosives. For common explosive, the flyer initiating sensitivity increases as the density is reduced. But for the fine-grained explosive, the test results are exactly opposite.     

Algorithm for Multi-laser-target Tracking Based on Clustering Fusion

Multi-laser-target tracking is an important subject in the field of signal processing of laser warners. A clustering method is applied to the measurement of laser warner, and the space-time fusion for measurements in the same cluster is accomplished. Real-time tracking of multi-laser-target and real-time picking of multi-laser-signal are introduced using data fusion of the measurements. A prototype device of the algorithm is built up. The results of experiments show that the algorithm is very effective.     

Influence of Installing Error on the Surface Shape Precision of the Axial Symmetry Aspheric Workpiece in Lapping

A method to calculate the surface shape error, which is caused by the installing error between the workpiece and the lapping tool in the process of form lapping, is proposed. The mathematical model which the installing translation error influences on the workpiece surface shape error is established. The changing rule of the error is simulated through the calculating example of the paraboloid workpiece. The results indicate that the surface shape error of the workpiece is increasing with the increase of the installing translation error, it is also increasing gradually along the center point of the curve surface to the edge, and the influence is severer to the curve surface with great curvature than that of the small curvature when the translation error is the same.     

Experimental Research on Output Performances of Giant Magnetostrictive Actuator

The paper introduces the performances of magnetostrictive actuators and its applications, discusses the design methods for the structure and internal magnetic circuit of a giant magnetostrictive actuator, and makes tests on the output displacement and force characteristics for an actuator using homemade magnetostrictive material. The experimental result shows that the actuator has satisfactory output precisions and ranges in transient and stable states, and can be used in lowfrequency vibration control system of precise equipment.     

Robust Graded Sliding Mode Tracking Control for Low Speed Spinning Ballistic Missiles

The nonlinear dynamic model of spinning ballistic missiles is established during the first boosting phase of the missile. Based on the conventional backstepping sliding mode control and the assumption of a two time-scale separation of missile dynamics, a graded sliding mode controller is designed with two sub-sliding surfaces which have invariability to external disturbances and parameter perturbations, and a matrix which comprises three first order low pass filters is introduced to prevent ＂explosion of terms＂. Owing to the upper bounds of the uncertainties are difficult to obtain in advance, adaptive laws are introduced to estimate the values of the uncertainties in real-time. Eventually, the numerical simulation results given to show the proposed controller can ensure the steady flight of missiles.